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What are Java Streams?

This is the introductory lesson on Java streams. You will learn why Java introduces streams and how developers can take advantage of them.

ggorantala
ggorantala
— 1 min read

Table of Contents

Introduction to Streams API

Java Streams is a powerful feature introduced in Java 8 that allows developers to process collections of data in a functional programming style.

A stream is a sequence of elements processed in parallel or sequentially.

Streams provide a concise and expressive way to manipulate collections of data by allowing developers to define a pipeline of operations that can be performed on the elements of the stream.

The pipeline typically consists of three parts:

  1. a source,
  2. zero or more intermediate operations,
  3. and a terminal operation.

Sketch

The source of a stream can be a collection, an array, an I/O channel, or any other data source.

Intermediate operations, such as filter(), map(), and sorted() transform and filter the elements of a stream to produce a new stream. Finally, a terminal operation, such as forEach(), reduce(), or collect(), performs a final action on the elements of the stream and produces a result.

The beauty of streams is that they allow developers to perform complex operations on collections of data in a single line of code and can easily leverage multi-core architectures for parallel processing to achieve better performance.

Note: Streams are a powerful tool for working with data collections in Java.

Learn or explore Streams API here: Streams API.

Java Streams APIJava
ggorantala

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Gopi has a decade of experience with a deep understanding of Java, Microservices, and React. He worked in India & Europe for startups, the EU government, and tech giants.

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